1 /*
2 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
3 This program and the accompanying materials are licensed and made available
4 under the terms and conditions of the BSD License that accompanies this
5 distribution. The full text of the license may be found at
6 http://opensource.org/licenses/bsd-license.
7
8 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
9 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
10
11 * Copyright (c) 1990, 1993
12 * The Regents of the University of California. All rights reserved.
13 *
14 * This code is derived from software contributed to Berkeley by
15 * Chris Torek.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 * 3. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40
41 NetBSD: fpurge.c,v 1.13 2003/08/07 16:43:24 agc Exp
42 fpurge.c 8.1 (Berkeley) 6/4/93
43 */
44 #include <LibConfig.h>
45 #include <sys/EfiCdefs.h>
46
47 #include <assert.h>
48 #include <errno.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <wchar.h>
52 #include "reentrant.h"
53 #include "local.h"
54
55 /*
56 * fpurge: like fflush, but without writing anything: leave the
57 * given FILE's buffer empty.
58 */
59 int
fpurge(fp)60 fpurge(fp)
61 FILE *fp;
62 {
63
64 _DIAGASSERT(fp != NULL);
65 if(fp == NULL) {
66 errno = EINVAL;
67 return (EOF);
68 }
69
70 if (fp->_flags == 0) {
71 errno = EBADF;
72 return (EOF);
73 }
74 FLOCKFILE(fp);
75 if (HASUB(fp))
76 FREEUB(fp);
77 WCIO_FREE(fp);
78 fp->_p = fp->_bf._base;
79 fp->_r = 0;
80 fp->_w = fp->_flags & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
81 FUNLOCKFILE(fp);
82 return (0);
83 }
84